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Ok, so this has been annoying me now for some time and I can not figure out what is causing this. I am wondering if anyone else is having this issue or noticed this.

In my css I have the html select options styled to look similar to this

On some computers it looks like how I've styled it and on some it appears something is overriding the style and then it looks like this

Some facts so far to help determine what is causing this.
All the computers I've tested are running windows 7.
My main pc that has numerous programs installed doe not have this issue.
My laptop has this issue.
My small pc that has a clean install with very few programs has this issue, also does not have any adobe products installed.
On the PC's with the issue, if I do a refresh in firefox the issue is fixed for about 5-10 min and then comes back.

If this were a CSS issue why would refreshing firefox temporarily fix and then later come back?

This leads me to think that some background plugin or setting is getting fetched after a refresh.

Could this be some other application on windows causing this?

Can someone tell me if they can reproduce this issue and also how to fix this and what is causing it?

Do note that when you do this, you're only bypassing thr problem on your local browser. If you deploy the site on the web, you either have to instruct users to do the same or live with the problem until Firefox fixes this in multiprocess.
– lightJun 6 '17 at 4:43

yes that is understood, the issue is in fact a bug with firefox and can only be fixed locally until firefox releases a new version with a fix.
– droohJun 6 '17 at 13:32